I got my m3501 today. It's interesting, it had what appeared to be white alps from the outside, but they weren't clicky. I took the switch's apart and they had rubber dampers on the side of the switch and different non clicky metal leaf springs. I guess those are really pinks/oranges, but with white sliders instead. Maybe it's an early version of pinks or something. I don't really like the feel, I'm changing them to true clicky whites. lol
One thing that this keyboard has is an alps grey slider caps lock which stays in a locked down position, which is pretty cool. lol